/* =========================================================
   FORA DA INTERNET MODERNA - Design System
   Tokens, tipografia, layout base, componentes reutilizaveis.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@500;600;700;800&family=Public+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  /* ---- cor: dark (padrao) ---- */
  --color-bg: #0b0d0c;
  --color-bg-elevated: #131615;
  --color-bg-inset: #0f1211;
  --color-border: rgba(255, 255, 255, 0.12);
  --color-border-strong: rgba(255, 255, 255, 0.24);
  --color-text: #eef1ef;
  --color-text-muted: #a7b0aa;
  --color-text-dim: #7a847e;
  --color-accent: #43d47f;
  --color-accent-strong: #6ee6a3;
  --color-accent-text: #06170d;
  --color-danger: #e2685a;
  --color-danger-bg: rgba(226, 104, 90, 0.12);
  --scanline-opacity: 0.035;

  /* ---- tipografia ---- */
  --font-display: 'Syne', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Public Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.8125rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.3125rem;
  --fs-xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --fs-2xl: clamp(1.9rem, 1.5rem + 2vw, 2.75rem);
  --fs-3xl: clamp(2.4rem, 1.8rem + 3vw, 3.75rem);
  --fs-4xl: clamp(2.75rem, 2rem + 4vw, 4.75rem);

  /* ---- espacamento ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6.5rem;

  /* ---- layout ---- */
  --container: 1160px;
  --container-prose: 700px;
  --radius: 3px;
  --nav-height: 68px;

  /* ---- movimento ---- */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 0.15s;
  --dur-base: 0.4s;
  --dur-slow: 0.8s;

  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --color-bg: #f5f6f4;
    --color-bg-elevated: #ffffff;
    --color-bg-inset: #eceeea;
    --color-border: rgba(10, 15, 12, 0.12);
    --color-border-strong: rgba(10, 15, 12, 0.26);
    --color-text: #10130f;
    --color-text-muted: #48524b;
    --color-text-dim: #5c655e;
    --color-accent: #167a48;
    --color-accent-strong: #0f5c37;
    --color-accent-text: #f5fff9;
    --color-danger: #a5372a;
    --color-danger-bg: rgba(165, 55, 42, 0.09);
    --scanline-opacity: 0.02;
    color-scheme: light;
  }
}

:root[data-theme="light"] {
  --color-bg: #f5f6f4;
  --color-bg-elevated: #ffffff;
  --color-bg-inset: #eceeea;
  --color-border: rgba(10, 15, 12, 0.12);
  --color-border-strong: rgba(10, 15, 12, 0.26);
  --color-text: #10130f;
  --color-text-muted: #48524b;
  --color-text-dim: #5c655e;
  --color-accent: #167a48;
  --color-accent-strong: #0f5c37;
  --color-accent-text: #f5fff9;
  --color-danger: #a5372a;
  --color-danger-bg: rgba(165, 55, 42, 0.09);
  --scanline-opacity: 0.02;
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
}

/* =========================== base =========================== */

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  transition: background-color var(--dur-base) var(--ease), color var(--dur-base) var(--ease);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.08;
}

h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }

p { color: var(--color-text-muted); line-height: 1.65; }

a { transition: color var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease); }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (max-width: 640px) {
  .container { padding-inline: var(--space-4); }
}

.prose {
  max-width: var(--container-prose);
}

section {
  padding-block: var(--space-9);
}

@media (max-width: 768px) {
  section { padding-block: var(--space-8); }
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  background: var(--color-accent);
  color: var(--color-accent-text);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  z-index: 200;
  transition: top var(--dur-fast) var(--ease);
}
.skip-link:focus {
  top: var(--space-4);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-accent-text);
}

/* =========================== utilitarios tipograficos =========================== */

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.eyebrow::before {
  content: '';
  width: 8px;
  height: 1px;
  background: var(--color-accent);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-7);
}

.section-head--wide {
  max-width: 780px;
}

.lede {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  max-width: 62ch;
}

.mono {
  font-family: var(--font-mono);
}

.text-accent {
  color: var(--color-accent);
}

.hr {
  border: none;
  border-top: 1px solid var(--color-border);
}

/* frases grandes de destaque, espalhadas entre secoes */
.statement {
  padding-block: var(--space-8);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.statement p {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-2xl);
  color: var(--color-text);
  line-height: 1.2;
  max-width: 880px;
  letter-spacing: -0.01em;
}
.statement p em {
  font-style: normal;
  color: var(--color-accent);
}

/* =========================== botoes =========================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0.9rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}
.btn:active { transform: scale(0.98); }

.btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
}
.btn--primary:hover { background: var(--color-accent-strong); }

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn--ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }

.btn--small {
  padding: 0.6rem 1.1rem;
  font-size: var(--fs-xs);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* =========================== nav =========================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  flex-shrink: 0;
}
.brand .brand-dot {
  width: 9px;
  height: 9px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav-links a {
  color: var(--color-text-muted);
  padding-block: var(--space-2);
  border-bottom: 1px solid transparent;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
  border-color: var(--color-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.theme-toggle,
.menu-toggle {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  border-radius: var(--radius);
  flex-shrink: 0;
}
.theme-toggle:hover,
.menu-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }
.theme-toggle svg,
.menu-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-sun,
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

.menu-toggle { display: none; }
.menu-toggle .icon-close { display: none; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .menu-toggle { display: inline-flex; }

  body.nav-open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--color-bg);
    padding: var(--space-6) var(--space-5);
    overflow-y: auto;
  }
  body.nav-open .nav-links a {
    width: 100%;
    padding-block: var(--space-4);
    font-size: var(--fs-md);
    border-bottom: 1px solid var(--color-border);
  }
  body.nav-open .menu-toggle .icon-menu { display: none; }
  body.nav-open .menu-toggle .icon-close { display: block; }
}

/* =========================== footer =========================== */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8) var(--space-6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-7);
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--color-border);
}

@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-6); }
}

.footer-brand p {
  margin-top: var(--space-3);
  max-width: 32ch;
}

.footer-col h5 {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-dim);
  margin-bottom: var(--space-4);
}
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col a { color: var(--color-text-muted); font-size: var(--fs-sm); }
.footer-col a:hover { color: var(--color-accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
}

/* =========================== cards =========================== */

.card {
  border: 1px solid var(--color-border);
  padding: var(--space-6);
  background: var(--color-bg-elevated);
}

.card-icon {
  width: 40px;
  height: 40px;
  color: var(--color-accent);
  margin-bottom: var(--space-5);
}
.card-icon svg { width: 100%; height: 100%; }

.card h3 { font-size: var(--fs-lg); margin-bottom: var(--space-3); }
.card p { font-size: var(--fs-sm); }

.card-principle {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
}

/* =========================== scroll reveal =========================== */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* =========================== CRT / textura sutil =========================== */

.crt-lines {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, var(--scanline-opacity)) 0px,
    rgba(255, 255, 255, var(--scanline-opacity)) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: overlay;
}

/* =========================== badges =========================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px solid var(--color-border-strong);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

/* =========================== progress bar =========================== */

.progress {
  height: 4px;
  width: 100%;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease);
}

/* =========================== checkbox custom =========================== */

.check-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}
.check-row:last-child { border-bottom: none; }

.check-box {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border: 1px solid var(--color-border-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: transparent;
}
.check-box svg {
  width: 12px;
  height: 12px;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
  color: var(--color-accent-text);
}
input:checked + .check-box,
.check-box.is-checked,
.check-box:has(input:checked) {
  background: var(--color-accent);
  border-color: var(--color-accent);
}
input:focus-visible + .check-box,
.check-box:has(input:focus-visible) {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
.check-box:has(input:checked) svg { opacity: 1; }
input:checked + .check-box svg,
.check-box.is-checked svg { opacity: 1; }

.check-label {
  font-size: var(--fs-sm);
  color: var(--color-text);
  cursor: pointer;
  line-height: 1.5;
}
.check-row.is-done .check-label {
  color: var(--color-text-dim);
  text-decoration: line-through;
  text-decoration-color: var(--color-border-strong);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}